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HCPL2611 Equivalent & Substitute Parts
Part Overview
The HCPL2611 is a logic output optoisolator manufactured by onsemi, featuring 2500Vrms isolation voltage, open collector output configuration, and 10Mbps data rate in an 8-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The HCPL2611 serves applications requiring galvanic isolation in digital signal transmission with moderate isolation voltage requirements and standard switching speeds.
Substiute Parts
Key Parameters
| Parameter | HCPL2611 (Main Part) |
|---|---|
| Manufacturer | onsemi |
| Product Status | Obsolete |
| Isolation Voltage | 2500Vrms |
| Output Type | Open Collector |
| Data Rate | 10Mbps |
| CMTI (Common Mode Transient Immunity) | 10kV/µs |
| Output Current | 50 mA |
| Supply Voltage | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Package | 8-DIP (0.300", 7.62mm) |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution for the HCPL2611 is determined by the following critical parameters: isolation voltage rating, output type (open collector configuration), data rate capability, CMTI specification, output current capacity, supply voltage compatibility, package form factor, and operating temperature range. Parts are grouped into three categories based on substitution suitability:
Direct Manufacturer Substitutes (Highest Compatibility): Parts maintaining identical or superior isolation voltage, matching output type, equivalent or higher data rate, and identical package. These parts are pin-compatible and functionally equivalent.
MFR Recommended Upgrades (Enhanced Performance): Parts offering higher isolation voltage (5000Vrms vs. 2500Vrms) with all other critical parameters maintained or improved, active product status, and extended operating temperature range.
Similar Function Parts (Application-Dependent): Parts with different output types (line receiver vs. open collector) or lower CMTI ratings, suitable only for applications where functional differences are acceptable.
Parameter Comparison
| Parameter | HCPL2611 | HCPL2611M | HCPL-2611 (Broadcom) | HCPL-260L | HCPL-260L-020E | HCPL-261A |
|---|---|---|---|---|---|---|
| Manufacturer | onsemi | onsemi | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited |
| Product Status | Obsolete | Active | Active | Active | Active | Active |
| Isolation Voltage | 2500Vrms | 5000Vrms | 3750Vrms | 3750Vrms | 5000Vrms | 3750Vrms |
| Output Type | Open Collector | Open Collector | Open Collector, Schottky Clamped | Open Collector, Schottky Clamped | Open Collector, Schottky Clamped | Open Collector, Schottky Clamped |
| Data Rate | 10Mbps | 10Mbps | 10MBd | 15MBd | 15MBd | 10MBd |
| CMTI (Min) | 10kV/µs | 10kV/µs | 15kV/µs | 10kV/µs | 10kV/µs | 1kV/µs |
| Output Current | 50 mA | 50 mA | 50 mA | 50 mA | 50 mA | 50 mA |
| Supply Voltage | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 2.7V ~ 3.6V, 4.5V ~ 5.5V | 2.7V ~ 3.6V, 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 100°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Package | 8-DIP | 8-DIP | 8-DIP | 8-DIP | 8-DIP | 8-DIP |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | RoHS non-compliant | RoHS non-compliant | ROHS3 Compliant | RoHS non-compliant |
Engineering Selection Recommendations
HCPL2611M (onsemi): Primary recommended substitute. Maintains onsemi manufacturer continuity with active product status. Offers doubled isolation voltage (5000Vrms) while preserving all electrical parameters. Extended operating temperature range (-40°C to 100°C) provides additional margin. ROHS3 compliant. Pin-compatible replacement requiring no circuit modifications.
HCPL-260L-020E (Broadcom Limited): Alternative substitute meeting isolation voltage requirement (5000Vrms) with ROHS3 compliance. Offers higher data rate (15MBd) and dual supply voltage support (2.7V-3.6V and 4.5V-5.5V). Schottky clamped output provides faster switching characteristics. Lower inventory availability (683 pcs) compared to alternatives.
HCPL-2611 (Broadcom Limited): Direct functional equivalent with 3750Vrms isolation voltage and active product status. Schottky clamped output and superior CMTI (15kV/µs) provide enhanced performance. RoHS non-compliant status may restrict use in regulated applications. Propagation delay increased to 100ns maximum.
HCPL-260L (Broadcom Limited): Suitable for applications tolerating 3750Vrms isolation voltage. Offers higher data rate (15MBd) and dual supply voltage capability. RoHS non-compliant. Adequate inventory availability (5600 pcs).
HCPL-261A (Broadcom Limited): Not recommended as primary substitute. Significantly reduced CMTI (1kV/µs) limits applicability to low-speed, low-noise-immunity applications. Reduced forward current rating (10mA) and increased propagation delay (100ns) indicate lower performance tier.
Frequently Asked Questions (FAQ)
Q: Can HCPL2611M directly replace HCPL2611 without circuit modifications?
A: Yes. HCPL2611M is pin-compatible with identical package (8-DIP), matching output type (open collector), equivalent output current (50 mA), and compatible supply voltage range (4.5V-5.5V). The higher isolation voltage (5000Vrms vs. 2500Vrms) is a performance enhancement, not a limitation.
Q: What is the significance of Schottky clamped output in substitute parts?
A: Schottky clamping reduces output voltage swing and propagation delay variation, improving switching speed consistency. Parts with Schottky clamped outputs (HCPL-2611, HCPL-260L series, HCPL-261A) exhibit faster rise/fall times and lower maximum propagation delays compared to standard open collector outputs.
Q: Why do some substitutes offer dual supply voltage ranges?
A: HCPL-260L and HCPL-260L-020E support both 2.7V-3.6V (3.3V logic) and 4.5V-5.5V (5V logic) supply ranges, providing design flexibility for mixed-voltage systems. The HCPL2611 and HCPL2611M support only 4.5V-5.5V range.
Q: What does CMTI (Common Mode Transient Immunity) represent?
A: CMTI specifies the maximum rate of voltage change on the isolated side that the optoisolator can tolerate without false triggering. Higher CMTI values indicate better immunity to noise and fast transients. HCPL2611 specifies 10kV/µs; HCPL-2611 (Broadcom) offers superior 15kV/µs.
Q: Are RoHS non-compliant parts acceptable for new designs?
A: RoHS compliance is mandatory for products sold into European Union markets and many regulated industries. ROHS3 compliant alternatives (HCPL2611M, HCPL-260L-020E) are required for new designs unless specific exemptions apply. RoHS non-compliant parts (HCPL-2611, HCPL-260L, HCPL-261A) are restricted to legacy system maintenance.
Q: How does data rate affect part selection?
A: Data rate specifies maximum signal frequency the optoisolator can reliably transmit. HCPL2611 supports 10Mbps; HCPL-260L variants support 15MBd. For applications operating below 10Mbps, all listed substitutes are functionally adequate. Higher data rate capability provides design margin but does not affect lower-speed operation.
Q: What is the difference between Mbps and MBd?
A: Mbps (megabits per second) and MBd (megabaud) are equivalent specifications for digital optoisolators. Both represent the maximum signal transition rate the device can process.
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